FatiguePro Automatic Cycle Counting Module
The cycle counting module in FatiguePro uses "smart logic" to systematically evaluate plant signals in order to count and categorize plant transient events. This module is intended to fulfill plant Technical Specification requirements for counting plant cycles. All transient events are automatically captured by the system, and all data and important plant parameters are saved for each event. Powerful data review capabilities are provided to graphically review all data, as well as calculate parameters such as stress and fatigue usage for each event.
Conditions may be placed on any event parameter (e.g. Tmax < 550°F). If the condition is not satisfied, FatiguePro will automatically mark it as such so you will be alerted. The current number of cycles are continuously monitored, with appropriate cycles flagged when the number exceeds the design basis. This system can be linked to the FMS to accommodate the counting of partial cycles.
Typical cycles to identify are shown below. These may vary considerably from system to system, based on vendor and FSAR requirements, and those shown below are provided only as an example..
| Pressurized Water Reactor (PWR) |
Boiling Water Reactor (BWR) |
| RCS Heatup |
Boltup |
| RCS Cooldown |
Ubolt |
| Pressurizer Heatup |
Reactor Overpressure with Delayed SCRAM |
| Pressurizer Cooldown |
Improper Start Cold Recirc Loop |
| Reactor Trip |
Sudden Start of Recirc Pump |
| Turbine Trip |
Improper Start Recirc Pumps Off |
| Shutdown Cooling |
Pipe Rupture and Blowdown |
| Loss of Charging |
Loss AC Power, Natural Recirc Start |
| Loss of Letdown |
Design Seismic at Steady State |
| Main Spray Actuation |
Maximum Earthquake at Steady State |
| Auxiliary Spray Actuation |
SLC Injection |
| Main Feedwater Actuation |
Core Spray Injection |
| Auxiliary Feedwater Actuation |
LPCI |
| Loss of Secondary Pressure |
HPCI |
| Loss of All RCS Flow |
RCIC |
| Safety Injection |
OBE + SRV |
| RCS Leak Test |
Design Hydrotest |
| RCS Hydrostatic Test |
Startup |
| Steam Generator Leak Test |
Shutdown |
| Steam Generator Hydrostatic Test |
Turbine Roll |
| Seismic Event |
Hot Standby |
| Safety Injection Check Valve Test |
Vessel Floodup |
|
Partial Feedwater Heater Bypass |
|
Turbine Bypass |
|
SCRAM |
|
Blowdown Scram |
|
Loss of Feedpumps |
|
Normal Operation |
|
Power Reduction to Zero |
|
SRV Actuation |
|
Zero Load State |
|
Loss of RWCU @ Rated Power |
|
Recirc Pump Trip |
|
RWCU Re-start without Recirc |
|
Bottom Head Stratification Relief |
Proceed to Cycle-Based Fatigue
|
